ninth chord
LowTechnical (Music)
Definition
Meaning
A chord consisting of a root, third, fifth, seventh, and ninth intervals above the root, giving it a complex, rich, and often jazzy or bluesy sound.
In a broader musical context, it can imply sophistication, emotional tension, or a departure from basic harmony. It is often used as a dominant chord.
Linguistics
Semantic Notes
The term is highly specific to music theory and performance. It refers to a precise structure, not just any chord that sounds 'rich' or 'complex'. The ninth is typically a major ninth unless specified otherwise (e.g., 'minor ninth', 'flat ninth').
Dialectal Variation
British vs American Usage
Differences
No significant lexical or conceptual differences. Spelling is consistent ('ninth', not 'nineth').
Connotations
Identical technical connotations in music theory globally.
Frequency
Equally low frequency outside of musical discourse in both regions.
Vocabulary
Collocations
Grammar
Valency Patterns
[Verb] a ninth chord (e.g., play, use, resolve, substitute)The ninth chord [verb] (e.g., resolves, functions, sounds)A [adjective] ninth chord (e.g., dominant, minor, unresolved)Vocabulary
Synonyms
Neutral
Weak
Vocabulary
Antonyms
Usage
Context Usage
Business
Not used.
Academic
Used exclusively in musicology, composition, and theory papers to analyse harmony.
Everyday
Extremely rare, only among musicians discussing music.
Technical
The primary domain. Core term in jazz, blues, pop, and classical music theory for describing specific harmonic structures.
Examples
By Part of Speech
verb
British English
- He then ninth-chorded his way through the bridge, much to the band's surprise.
American English
- The arranger ninth-chorded the progression for a more contemporary sound.
adjective
British English
- The piece had a distinctly ninth-chord feel in its harmonies.
American English
- They explored a ninth-chord voicing on the keyboard.
Examples
By CEFR Level
- The song uses a ninth chord, which makes it sound jazzy.
- To create tension before the chorus, the composer substituted the standard dominant chord with a dominant ninth chord.
- A minor ninth chord can evoke a sense of melancholy and sophistication.
- The pianist's innovative reharmonisation relied heavily on altered ninth chords, including the sharp-eleven and flat-thirteen extensions, to create a constantly shifting tonal landscape.
- In jazz theory, the resolution of a ninth chord often involves voice-leading the ninth down to the fifth or the root of the subsequent tonic chord.
Learning
Memory Aids
Mnemonic
Think of it as a 'stack of thirds' on a scale: Root (1st), third, fifth, seventh, and finally the note that would be the ninth step of the scale (which is the same as the second, but an octave higher).
Conceptual Metaphor
HARMONY IS ARCHITECTURE / LAYERING: The chord is built by adding layers (intervals) on top of a foundation (the root).
Watch out
Common Pitfalls
Translation Traps (for Russian speakers)
- Avoid translating as 'аккорд девятого' (chord of the ninth) in a spatial/ordinal sense. The established term is 'нонаккорд' (nonakkord).
- Do not confuse with 'девятый аккорд', which is a non-standard calque.
Common Mistakes
- Mispronouncing 'ninth' as 'nineth'.
- Confusing it with a 'sus2' chord or an 'add9' chord, which lack the seventh.
- Using the term to describe any dissonant or unfamiliar chord.
Practice
Quiz
What is the defining characteristic of a standard ninth chord compared to a simple triad?
FAQ
Frequently Asked Questions
No. A ninth chord (e.g., C9) contains a root, third, fifth, seventh, and ninth. An 'add9' chord (e.g., Cadd9) contains a root, third, fifth, and ninth, but specifically omits the seventh, giving it a different, often more open, sound.
Yes. A 'minor ninth' chord (e.g., Cm9) is built on a minor triad, containing a root, minor third, perfect fifth, minor seventh, and major ninth (unless otherwise altered, e.g., 'minor-major ninth').
The dominant ninth chord (V9) creates strong tension due to the dissonance of the minor seventh and the ninth against the root. This tension strongly desires resolution to the tonic chord (I), making it a powerful tool in functional harmony, especially in jazz and blues.
Not necessarily. In practice, especially on guitar or in dense piano voicings, one or more notes (often the root or fifth) may be omitted or played by another instrument. The essential character is defined by the presence of the third, seventh, and ninth.